Keystones — Capstone
Five GCSE retrieval questions · 10 September 2013 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² - 7x - 7
Answer: (x - 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 47°. Give your answer to 2 decimal places
Answer: 219.41cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 12, 22, 60, 93, 99, 27, 19. Give your answer to 2 decimal places
Answer: Mean = 43.38, Median = 24.5, Range = 87